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5 results on '"Adaptive secondary"'

1. Optical calibration of the M4 prototype toward the final unit

Author

Briguglio, Runa, Pariani, Giorgio, Xompero, Marco, Riccardi, Armando, Adrighettoni, Mario, Biasi, Roberto, Tinori, Matteo, and Gallieni, Daniele

Subjects
adaptive secondary
Abstract

The M4DP is the demonstration prototype of the E-ELT adaptive mirror M4. The opticalcalibration and test of the M4DP, held in INAF laboratories during February and March 2015, has beena lesson learned for the forthcoming optical verification of the 5000 actuators, 6 segments final unit.The test procedure was tailored to fit the peculiarities of such 2 segments, 222 actuators prototype. Keyelements are the simultaneous segments control and the measurement and correction of the rigid modesover the segmented pupil; convection noise aecting the phasing was also investigated. In this paper wewill report the results of the optical test and the specific solutions implemented for the phasing controland performance verification.

Published
2015

2. SHARK-NIR Channel: a high contrast imager with coronagraphic capabilities for the Large Binocular Telescope

Author

Farinato, Jacopo, Baffa, Carlo, Baruffolo, Andrea, Bergomi, Maria, Carbonaro, Luca, Carolo, Elena, Carlotti, Alexis, Centrone, Mauro, Close, Laird, De Pascale, Marco, Dima, Marco, Esposito, Simone, Fantinel, Daniela, Farisato, Giancarlo, Gaessler, Wolfgang, Giallongo, Emanuele, Greggio, Davide, Guyon, Olivier, Hinz, Philip, Lisi, Franco, Magrin, Demetrio, Marafatto, Luca, Pedichini, Fernando, Pinna, Enrico, Puglisi, Alfio, Ragazzoni, Roberto, Salasnich, Bernardo, Stangalini, Marco, Vassallo, Daniele, Verinaud, Christophe, and Viotto, Valentina

Subjects
planet finding, coronagraphs, pyramid sensor, adaptive secondary, extreme adaptive optics, large binocular telescope
Abstract

A new coronagraphic instrument for the Large Binocular Telescope (LBT) has successfully passed the conceptual design phase. SHARK-NIR channel will be installed in one arm of the Large Binocular Telescope and it is designed to use different coronagraphic techniques, both to match as much as possible the different requirements of the different science cases and to explore the capabilities of such techniques for the next-generation of ELTs. By exploiting the combination with SHARK-VIS channel mounted at the other LBT arm, the instrument will offer simultaneous coronagraphic observations at different wavelengths, characterized by high contrast, even for relatively faint targets. This will be achievable thanks to the very efficient Adaptive Optics (AO) systems already operating at LBT (First Light AO, FLAO). Furthermore, the latter will be soon upgraded with new detectors, promising even better performance in terms of limiting magnitude. In this paper we present the status of the SHARK-NIR channel design.

Published
2015

3. Advances of TNO's electromagnetic deformable mirror development

Subjects
Industrial Innovation, Deformable mirrors, High Tech Systems & Materials, Deformation, Aberration correction, Laser mirrors, Atmospheric aberration, Free space laser communications, Variable reluctance, Fine steering mirrors, Actuator technology, Linear actuators, Delta modulation, Electronics, Adaptive secondary, Adaptive optics, Laser applications, Telescopes
Abstract

TNO is developing Deformable Mirror (DM) technology, targeted for aberration correction in high-end Adaptive Optics (AO) applications in the field of lithography, astronomy, space and laser communication. The heart of this deformable mirror technology is a unique actuator technology based on the variable reluctance principle. The main advantages of this technology are the inherent high reliability, linearity (>99%), and high efficiency in terms of force per volume and unit power. Based on this actuator technology TNO built and tested a prototype DM, with 57 actuators, and a mirror diameter of Ø160mm. The test results show a highly linear actuator response, with less than 1% hysteresis over a stroke of 40μm. Atmospheric aberration correction has been shown with these DM's in a free space laser-communication bread board. The same actuator technology is also used in the application of a highly compact Fine Steering Mirror (FSM), with an overall volume of Ø27x30mm, with a Ø20mm mirror. This FSM is targeted for satellite-based lasercommunication terminals. Furthermore, a design study has been carried out to show the scalability of this technology towards large (~Ø1m to ~Ø3m) adaptive (secondary) mirrors with several hundreds, up to thousands of actuators. In this paper these different DM and FSM's are discussed, and the latest test results obtained with the DM prototypes are presented.

Published
2018

4. Advances of TNO's electromagnetic deformable mirror development

Author

Kuiper, S., Doelman, N.J., Human, J.D., Saathof, R., Klop, W.A., and Maniscalco, M.P.

Subjects
Industrial Innovation, Deformable mirrors, High Tech Systems & Materials, Deformation, Aberration correction, Laser mirrors, Atmospheric aberration, Free space laser communications, Variable reluctance, Fine steering mirrors, Actuator technology, Linear actuators, Delta modulation, Electronics, Adaptive secondary, Adaptive optics, Laser applications, Telescopes
Abstract

TNO is developing Deformable Mirror (DM) technology, targeted for aberration correction in high-end Adaptive Optics (AO) applications in the field of lithography, astronomy, space and laser communication. The heart of this deformable mirror technology is a unique actuator technology based on the variable reluctance principle. The main advantages of this technology are the inherent high reliability, linearity (>99%), and high efficiency in terms of force per volume and unit power. Based on this actuator technology TNO built and tested a prototype DM, with 57 actuators, and a mirror diameter of Ø160mm. The test results show a highly linear actuator response, with less than 1% hysteresis over a stroke of 40μm. Atmospheric aberration correction has been shown with these DM's in a free space laser-communication bread board. The same actuator technology is also used in the application of a highly compact Fine Steering Mirror (FSM), with an overall volume of Ø27x30mm, with a Ø20mm mirror. This FSM is targeted for satellite-based lasercommunication terminals. Furthermore, a design study has been carried out to show the scalability of this technology towards large (~Ø1m to ~Ø3m) adaptive (secondary) mirrors with several hundreds, up to thousands of actuators. In this paper these different DM and FSM's are discussed, and the latest test results obtained with the DM prototypes are presented.

Published
2018

5. SHARK (System for coronagraphy with High order Adaptive optics from R to K band): A proposal for the LBT 2nd generation instrumentation

Author

Farinato, Jacopo, Pedichini, Fernando, Pinna, Enrico, Baciotti, Francesca, Baffa, Carlo, Baruffolo, Andrea, Bergomi, Maria, Bruno, Pietro, Cappellaro, Enrico, Carbonaro, Luca, Carlotti, Alexis, Centrone, Mauro, Close, Laird, Codona, Johanan, Desidera, Silvano, Dima, Marco, Esposito, Simone, Fantinel, Daniela, Farisato, Giancarlo, Fontana, Adriano, Gaessler, Wolfgang, Giallongo, Emanuele, Gratton, Raffaele, Greggio, Davide, Guerra, Juan, Carlos, Guyon, Olivier, Hinz, Philip, Leone, Francesco, Lisi, Franco, Magrin, Demetrio, Marafatto, Luca, Munari, Matteo, Pagano, Isabella, Puglisi, Alfio, Ragazzoni, Roberto, Salasnich, Bernardo, Sani, Eleonora, Scuderi, Salvo, Stangalini, Marco, Testa, Vincenzo, Verinaud, Christophe, and Viotto, Valentina

Subjects
Physics, business.industry, adaptive secondary, coronagraphy, extreme adaptive optics, large binocular telescope, planet finding, pyramid sensor, Applied Mathematics, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Detector, Strehl ratio, Large Binocular Telescope, First light, Technical feasibility, Optics, Electronic engineering, Electronic, Instrumentation (computer programming), Optical and Magnetic Materials, business, Adaptive optics, Communication channel
Abstract

This article presents a proposal aimed at investigating the technical feasibility and the scientific capabilities of high contrast cameras to be implemented at LBT. Such an instrument will fully exploit the unique LBT capabilities in Adaptive Optics (AO) as demonstrated by the First Light Adaptive Optics (FLAO) system, which is obtaining excellent results in terms of performance and reliability. The aim of this proposal is to show the scientific interest of such a project, together with a conceptual opto-mechanical study which shows its technical feasibility, taking advantage of the already existing AO systems, which are delivering the highest Strehl experienced in nowadays existing telescopes. Two channels are foreseen for SHARK, a near infrared channel (2.5-0.9 um) and a visible one (0.9 – 0.6 um), both providing imaging and coronagraphic modes. The visible channel is equipped with a very fast and low noise detector running at 1.0 kfps and an IFU spectroscopic port to provide low and medium resolution spectra of 1.5 x 1.5 arcsec fields. The search of extra solar giant planets is the main science case and the driver for the technical choices of SHARK, but leaving room for several other interesting scientific topics, which will be briefly depicted here.

Published
2014

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